For a while I sometimes had a thought if it were possible to put the OS completely in EFI and run an application completely in cache since both types of memory

For a while I sometimes had a thought if it were possible to put the OS completely in EFI and run an application completely in cache since both types of memory are quite big now. I mean I used to run Windows 95 with 8MB of RAM, Linux with 1MB, while a Xeon already has 16MB of cache. That should be one hell of a fast computer